Corrected entry: When Mr Burns asks Larry about his life, he mentions that he stayed at the orphanage until he was 18, and then got the job at the stall. He also mentions the small detail of seeing a blimp. Yet at the end of the episode, he says he has a wife and kids. Wouldn't he have mentioned them earlier to Mr Burns, if he included such a petty detail as a blimp?

Correction:See, that's the entire joke: to Larry, the appearance of a blimp was more interesting than his wife and kids. The reveal at the end of the ep (that he has this family) is funny for precisely that reason - that he's ignored them entirely all this time, with no concern. Just because you don't get a joke doesn't mean it's a mistake.

This is a mistake for the introduction for the later episodes. When Homer screams, he turns round. You see this in a wide shot. There are no boxes to the right of the door in the garage. However, two just appear out of thin air when he runs through the garage.